<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="../../css/计数器.css">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <div class="input-num">
            <button @click="sub">-</button>
            <span>{{num}}</span>
            <button @click="add">+</button>
        </div>
        <img src="../../images/图片1.gif" />
    </div>

    <script src="../../js/vue.js"></script>
    <script>
        var app = new Vue({
            el: '#app',
            data: {
                num:'0'
            },
            methods: {
                add: function() {
                    if(this.num < 10){
                        this.num++;
                    } else {
                        alert("别点了，最大了")
                    }
                },
                sub: function() {
                    if(this.num > 0){
                        this.num--;
                    } else {
                        alert("别点了，最小了")
                    }
                }
            }
        });
    </script>
</body>
</html>